v3.26.1
Inventories
6 Months Ended
Jun. 30, 2026
Inventory Disclosure [Abstract]  
Inventories

8. Inventories

We value our raw materials, work in process, and finished goods inventories using lower of cost, as determined by the average cost method, or net realizable value. Supplies and materials are valued at the first-in, first-out (FIFO) or average cost method.

The components of inventories were as follows (dollars in millions):

 

 

 

June 30,

 

 

December 31,

 

 

 

2026

 

 

2025

 

Raw materials

 

$

385.1

 

 

$

416.6

 

Work in process

 

 

20.7

 

 

 

17.5

 

Finished goods

 

 

257.9

 

 

 

241.6

 

Supplies and materials

 

 

598.7

 

 

 

567.5

 

Inventories

 

$

1,262.4

 

 

$

1,243.2